I just catched a bug. It is not effected by re-loading the saves, it does not solve the problem, which is the following:

When the boss is trying to go back to his "shelter", he stucks at the border of its entrance. He is just flying happily, ignoring all types of damage (health bar is not visible I know). I have reloaded the save about 7 times, no change at all. So again, I cannot finish the game.

When you load your save file are you at the hub or already in the arena where you fight the Primagen?

If the last thing applies I would try to load a save file where you are at the hub before you enter the final boss arena and see if this will maybe help fixing the bug you have. No guarantie that this will work since it's only an idea that could maybe help.

Thanks for the information!

Alas, i cannot try it now, because i just uninstalled the game as i saw the patch coming out. I think, i will wait for 1-2 months while all the common bugs will be explored and 'ill be corrected. Thanks again!